Back Orifice 2000 (BO2K) debuted on July 10, 1999 at DEF CON 7. The original code was written by Dildog, a member of US hacker group Cult of the Dead Cow (cDc). It was the successor to the cDc's Back Orifice remote administration tool, released the previous year.
Whereas the original Back Orifice was limited to the Windows 95 and Windows 98 operating systems, BO2K also supports Windows NT. In addition, BO2K was released open source.
